Dual Delta-Sigma Modulator And Encoder

The DS8102 is a stand-alone, dual-channel, delta- sigma Modulator that converts measurements from two differential Analog input pairs into a Manchester-encod- ed output bit stream that CAN be processed by a com- panion Microcontroller such as the MAXQ3108. One channel operates at a fixed 1x gain, while the other operates at a pin-selectable gain of 1x, 4x, 16x, or 32x. The DS8102 includes an internal power-supply monitor, on-board Voltage Reference and low-power Oscillator to reduce the number of external components required for data acquisition. The Manchester-encoded output from the DS8102 combines pulse-density-modulated measurement val- ues from both differential input channels with a syn- chronization bit stream and is transmitted over a single pin. This transmission scheme is ideal for split voltage domain applications where the DS8102 and other “hot”- side components must be electrically isolated from “cold” low-voltage components such as a companion Microcontroller In this type of application, the DS8102 CAN be capacitively coupled to a companion microcon- troller with only two connection points required (MNOUT and DGND). By Maxim Integrated Products